I cant say that I think qualitative is better than quantitative. I think they complement each other. Each methodology provides differend kinds of knowledge that are useful in nursing.
Qualitative research provides an understanding of human experiences, which cannot be objectively measured. We know that there are many things about people that we cannot measure, yet they effect health (mind/body/spirit). Nurses are involved with patients whose life experiences with a particular situation are unknown to us. We've never experienced their circumstance. For example, I've never had breast cancer, but by reading qualitative studies that describe the lived experience as told by breast cancer survivors, we can gain understanding of some of the common fears, hopes, thoughts, and experiences that are common to breast cancer survivors, which I believe enhances quality of care. I use this topic as an example, but there are many more such as, the lived experience of having a child with a chronic illness, or the lived experience of being a victim of domestic violence. It provides nurses insight into these most personal life experiences of others.
Anyway, hope this helps. Research is a passion of mine.